A model of cosmology , that arises from the hypothesis that ordinary matter , dark matter and dark energy are made of the same stuff , is studied .
It is argued that this hypothesis is a consequence of considering space and time in the same footing .
The model provides a solution to the cosmic coincidence problem predicting , without fine-tuning , values of \Omega _ { m } \approx 0.32 , \Omega _ { \Lambda } \approx 0.68 and \Omega _ { b } \approx 0.04 in agreement with observations .
Besides , the model does not suffer from neither the flatness nor the horizon problems , does not appear to spoil the successes of cosmic nucleosynthesis calculations and allows for the formation of galaxies and clusters .